package com.helloblog.utils;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;

import com.swetake.util.Qrcode;

public class EncodeHandler {
	public void encoderQRCoder(String content, HttpServletResponse response) {  
        try {  
            Qrcode handler = new Qrcode();  
            // 设置二维码排错率，可选L(7%)、M(15%)、Q(25%)、H(30%)，排错率越高可存储的信息越少，但对二维码清晰度的要求越小
            handler.setQrcodeErrorCorrect('L');  
            //编码模式：数字:Numeric   英文字母：Alphanumeric  二进制：Binary  汉字：Kanji  
            handler.setQrcodeEncodeMode('B');  
            //版本： 1-40 共40个版本：  (1:21x21模块；  2:177x177模块)  
            handler.setQrcodeVersion(5);  
              
            System.out.println(content);  
            byte[] contentBytes = content.getBytes("UTF-8");            
             System.out.println(contentBytes.length);        
            BufferedImage bufImg = new BufferedImage(115, 115, BufferedImage.TYPE_INT_RGB);  
              
            Graphics2D gs = bufImg.createGraphics();  
              
            gs.setBackground(Color.WHITE);  
            gs.clearRect(0, 0, 115, 115);  
              
            //设定图像颜色：BLACK  
            gs.setColor(Color.BLACK);  
              
            //设置偏移量  不设置肯能导致解析出错  
            int pixoff = 2;  
            //输出内容：二维码  
            if(contentBytes.length > 0 && contentBytes.length < 124) {  
                boolean[][] codeOut = handler.calQrcode(contentBytes);  
                for(int i = 0; i < codeOut.length; i++) {  
                    for(int j = 0; j < codeOut.length; j++) {  
                        if(codeOut[j][i]) {  
                            gs.fillRect(j * 3 + pixoff, i * 3 + pixoff,3, 3);  
                        }  
                    }  
                }  
            } else {  
                System.err.println("QRCode content bytes length = " + contentBytes.length + " not in [ 0,120 ]. ");  
            }  
              
            gs.dispose();  
            bufImg.flush();  
              
           /* File imgFile = new File(imgPath); 
            ImageIO.write(bufImg, "png", imgFile); */
              
            //生成二维码QRCode图片  
            response.setCharacterEncoding("utf-8");
            ImageIO.write(bufImg, "png", response.getOutputStream());  
              
              
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
}
